Black map info panel at the middle ? i'm not sure about which one you are meaning...

If you mean the map vote panel at the end of the map, then probably you have set $_ml_vote_ask to true, set it back to false to not get it.
For the upper right one with map info it's in fast.php : change the $_mapinfo_default value.
I don't see what other map info panel you get on stock Fast, so if you get another one it is probably done by some plugin that you have added.